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Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is:

1. A Grignard reagent
2. Hydrazine in presence of feebly acidic solution
3. Hydrocyanic acid
4. Sodium hydrogen sulphite

Correct answer: Hydrazine in presence of feebly acidic solution

Solution

Hydrazine reacts with carbonyl compounds in a feebly acidic medium to form hydrazones via nucleophilic addition followed by elimination of water.

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